"We didn't talk much either, but he did seem a lot happier with his new life. Getting to start over and letting go of his old pain. Despite what he did, even making Yusuke forget we're dating, I can't bring myself to hate him to be honest."

Likely because of their former bond, and learning how he got to that point. That said, it'll likely take a very long time before he could be comfortable around him. Or really any version of Maruki.